| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.47 | 1.62 | 1.37 |
| 2024 | 1.14 | 1.58 | 0.82 |
| 2023 | 1.25 | 1.51 | 1 |
| 2022 | 1.82 | 2.45 | 1.38 |
| 2021 | 1.52 | 2.54 | 1.03 |
| 2020 | 1.1 | 1.27 | 0.9 |
| 2019 | 0.86 | 1.08 | 0.69 |
| 2018 | 0.87 | 1.14 | 0.7 |
| 2017 | 1.86 | 3.73 | 1.09 |
| 2016 | 2.31 | 3.19 | 1.96 |
| 2015 | 3.75 | 7.21 | 1.6 |
| 2014 | 1.51 | 2.42 | 1.02 |
| 2013 | 1.17 | 1.97 | 1.07 |
| 2012 | 1.13 | 1.41 | 0.93 |
| 2011 | 1.61 | 1.92 | 1.05 |
| 2010 | 1.71 | 2 | 1.39 |
| 2009 | 1.65 | 2.17 | 1.06 |
| 2008 | 1.54 | 3.07 | 0.67 |
| 2007 | 2.23 | 3.24 | 1.01 |
| 2006 | 0.92 | 1.14 | 0.68 |
| 2005 | 0.81 | 1.03 | 0.66 |
| 2004 | 1.32 | 1.71 | 1 |
| 2003 | 1.49 | 1.77 | 1.22 |